(1999+1997分之1)×1998分之1

问题描述:

(1999+1997分之1)×1998分之1
简便计算

(1999+1/1997)×(1/1998)
=(1998+1+1/1997)×(1/1998)
=(1998+1998/1997)×(1/1998)
=1+1/1997
=1998/1997